US3710437A - Method of preparing insulated coil in slotted core - Google Patents

Method of preparing insulated coil in slotted core Download PDF

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Publication number
US3710437A
US3710437A US00061106A US3710437DA US3710437A US 3710437 A US3710437 A US 3710437A US 00061106 A US00061106 A US 00061106A US 3710437D A US3710437D A US 3710437DA US 3710437 A US3710437 A US 3710437A
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United States
Prior art keywords
coil
core
resin
slot
powdered
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00061106A
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English (en)
Inventor
A Leader
H Kipple
C Price
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Westinghouse Electric Corp
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Westinghouse Electric Corp
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Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Application granted granted Critical
Publication of US3710437A publication Critical patent/US3710437A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • Y10T29/49012—Rotor

Definitions

  • ABSTRACT A process for applying a coating of insulating, heat [21] Appl hardenable resin to coil turns or windings for use in electrical apparatus, by placing; coils of turns or LS. Cl. windings in lots of a ore of magnetic material 29/593 packing the interstices between the turns or windings [51] f 15/025 15/10 15/12 and the slot walls with a powder of heat hardenable [58] Field of Search...
  • This invention relates to electrical insulation and, more particularly, it pertains to a method for applying a synthetic resinous composition as insulation for use in slots in magnetizable cores of dynamo-electric machines or other electrical apparatus.
  • a method that would eliminate or reduce the amount of taping and wrapping required on all types of rewound rotating apparatus would be desirable.
  • a reduction of subsequent treatment cycles has been sought. More particularly, in the area of form-wound apparatus, stators, rotors, armatures, direct current fields, and rotating fields, the methods remain the same; i.e., mostly hand-taping, varnish treatment, and approximately 12 -hou-r baking cycles.
  • FIG. 1 is a flow chartillustrating the method of the invention
  • FIG. 2 is a sectional view through a stator slot with unformed coils (mush) and particles of powdered uncured resin therein;
  • FIG. 3 is a sectional view of the assembly shown in FIG. 4 with the resin in the cured condition;
  • FIG. 4 is a sectional view through a stator slot with unformed coils enclosed in a wrapper and in particles of powdered uncured resin;
  • FIG. 5 is a sectional view of the assembly shown in FIG. 3 with the resin in the cured conditionj DESCRIPTION OF THE PREFERRED EMBODIMENT
  • the process involves the steps of winding coils in core slots of a stator, packing the interstices between the individual wires or windings and the sides of slots with powdered resinous material, heating the assembly of the stator, windings, and the resinous material to a temperature sufficient to melt it so that itwill flow into any remaining voids and to cure the resinous material, applying additional powdered fusible resinous material to the end turns of the coils, and reheating the entire assembly to cure the resinous material on the end turns of the'coil.
  • the process is primarily applicable to unformed or mush coils as shown in FIGS. 2 and 3.
  • the unformed or mush type of coils are inserted in a coil slot 10 of a laminated stator 12.
  • Each slot is preliminarily provided with a liner 14 of sheet-like material composed of insulating material such as resin and mica.
  • a lower coil side 16 is then inserted in place in the lower portion of the slot 10 after which an upper coil side 18 is placed above the lower coil side.
  • An insulating separator 20 is disposed between the upper and lower coil sides 18 and 16.
  • the lower coil'side 16 is composed of a plurality of individual wires or windings 22 and the upper coil side 18 is composed of a similar number of individual wires or windings 24.
  • wires 22 and 24 are provided with a resinous enamel coating to provide turn-to-turn insulation, such enamel coated wires are well-known in the art and are readily available.
  • a wedge 26 is provided at the upper end of the slot to retain the coil sides tightly in place.
  • a stator core: 28 may be provided with a slot 30 havingstraight side walls, instead of the shape of the slot 10 (FIG. 2).
  • the slot 30 enables the insertion of preformed lower and upper coil sides 32' and 34 containing wires 36 and 38 which are first enclosed in separate wrappers or slot liners 40 and 42, respectively.
  • the wrappers 40 and 42 are wrapped around their corresponding coil sides four or five times before the sides are inserted into the slot 30.
  • the wrappers 40 and 42 are composed of mica particles or flakes bonded together with a resinous'material such as epoxy resin.
  • the resinous material is a fusible or B- staged resin.
  • a wedge 44 is inserted at outer end of the slot.
  • the assembly is ready for the introduction of particles 46 (FIG. 2) and end of the slots between the several windings 22, 24, 36 and 38 where the particles under vibration compact and build up until all interstices between the windings as well as between the windings and the liner or wrapping are filled.
  • the resinous material is composed of a powder of either a fusible resinous material or a B-staged resin and may be a thermoplastic resin or thermosettable resin which has been only partially cured or advanced to a B-stage so that the resin particles will fuse, flow together, and form a bond.
  • the fusible thermosettable resin may, of course, be ultimately cured to a fully cured infusible state.
  • the thermoplastic type of resins may be employed if they do not soften at the operating temperature of the apparatus. The thermoplastic resins are simply cooled after they melt.
  • a preferred composition of the thermosettable type resin is a homogeneous blend of two solid DGEBA epoxy resins, a pigment, an amine curing agent, and a silica filler.
  • the slots are completely filled with particles of powdered resin, and the entire assembly of the stator core filled with the powdered resin is heated to melt and then cure the resin.
  • the temperature to which the assembly is heated is dependent upon the type of resin constituting the powdered resin or resin blend. For most purposes, however, a stator is heated to a temperature range of from about 150 to 350 F. In some instances a temperature of 400 F may be desirable where the resin has a high melting or curing temperature.
  • stator is heated to about 350 F., which is suitable for most resins
  • stator is held at that temperature for a sufficient time to permit the molten resin to flow into all remaining fine interstices and voids in the coil and between the coil and the core and to enable the resin to be completely cured.
  • any fusible resin in the wrappers 40 and 42 fuses and flows to mix with the fused particles to form part of the solid resinous bodies 50 and 52.
  • each winding is encased separately within the body 50 or 52 of the solid resinous material where it is held firmly in place and thereby prevents the windings from a vibrating movement which, during the life of the stator, will cause rubbing abrasions between adjacent windings and the core walls, resulting in grounding of the winding and shorting of the circuit.
  • the solid resinous material in the slot assures better heat transfer from the windings to the core.
  • the stator is immediately removed from the heating oven and, while the end turns of the coils are still hot, particles of powdered fusible resin, for example the heretofore described DGEBA epoxy resin blend, are applied by spraying, pouring, immersion in a fluidized bed or otherwise, to the end turns until they are completely covered with a resinous coating which bonds with the resin previously applied in the slots.
  • powdered fusible resin for example the heretofore described DGEBA epoxy resin blend
  • the foregoing procedure may be adapted to installing coils in stators of electrical equipment of varying sizes.
  • the process is particularly adaptable for use with stators having a size of from about 4 inches to 6 feet in diameter and involving electrical equipment handling upwards of 3,000 volts.
  • the steps comprising assembling the electrical coil in the slot of the magnetic core, disposing the assembled coil and the magnetic core so that the slot is generally vertical, applying to the upper end of the coil a dry powdered thermoplastic resin having a melting point above the maximum operating temperatures the coil and core will be subjected to when in service, vibrating the assembled core and coil so that the powdered resin flows downwardly into the interstices between the turns of the winding and the spaces between the coil and core slot walls and the powdered resin fills and packs the interstices and spaces, thereafter heating the assembled core and coil with the powdered resin filling to atemperature above the melting temperature of the powdered resin so that the resin melts and flows into all the interstices of the slot portion of the coil and the spaces, cooling the core and coil assembly to solidify the thermoplastic resin whereby to provide a solidly bonded coil and core,and finally applying a

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
US00061106A 1970-08-05 1970-08-05 Method of preparing insulated coil in slotted core Expired - Lifetime US3710437A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6110670A 1970-08-05 1970-08-05

Publications (1)

Publication Number Publication Date
US3710437A true US3710437A (en) 1973-01-16

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Application Number Title Priority Date Filing Date
US00061106A Expired - Lifetime US3710437A (en) 1970-08-05 1970-08-05 Method of preparing insulated coil in slotted core

Country Status (7)

Country Link
US (1) US3710437A (en:Method)
JP (1) JPS474373A (en:Method)
BE (1) BE770858A (en:Method)
CA (1) CA949731A (en:Method)
ES (1) ES393485A1 (en:Method)
FR (1) FR2103966A5 (en:Method)
GB (1) GB1349386A (en:Method)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877142A (en) * 1970-12-27 1975-04-15 Nippon Denso Co Method of making a rotary electric machine especially suitable for use as a starter for automotive vehicle engines
US4112041A (en) * 1975-02-17 1978-09-05 Canadian General Electric Company Method for reducing corona in dynamoelectric machines
US4289722A (en) * 1980-07-28 1981-09-15 General Motors Corporation Method of potting magnetic speed pickups
DE3346031A1 (de) * 1982-12-20 1984-06-20 Mitsubishi Denki K.K., Tokio/Tokyo Spulenisolationsverfahren fuer elektrische maschinen
DE3528492A1 (de) * 1985-08-08 1987-02-12 Resicoat Gmbh Verfahren zum schuetzen von elektrischen bauteilen
US6075304A (en) * 1997-04-30 2000-06-13 Alon Co., Ltd Stator with molded encasement for small motors and manufacturing process therefor
WO2002035685A1 (fr) * 2000-10-25 2002-05-02 Conception Et Developpement Michelin Machine electrique tournante et procede de fabrication
US6484388B1 (en) * 2000-08-10 2002-11-26 Delphi Technologies, Inc. Sequential roll-forming process for a stator
US20050057113A1 (en) * 2003-09-05 2005-03-17 Du Hung T. Field assemblies and methods of making same
US20050099087A1 (en) * 2003-09-05 2005-05-12 Du Hung T. Electric motor with field assemblies having core pieces with mating features
US20050101695A1 (en) * 2001-09-28 2005-05-12 Yoshihiko Wada Insulating material for electric device coil and slot liner of rotating electric machine
US20050189844A1 (en) * 2003-09-05 2005-09-01 Du Hung T. Field assemblies having pole pieces with dovetail features for attaching to a back iron piece(s) and methods of making same
US20050189839A1 (en) * 2003-09-05 2005-09-01 Du Hung T. Field assemblies having pole pieces with ends that decrease in width, and methods of making same
US20050189840A1 (en) * 2003-09-05 2005-09-01 Du Hung T. Field assemblies having pole pieces with axial lengths less than an axial length of a back iron portion and methods of making same
US20050241131A1 (en) * 2004-04-28 2005-11-03 Sensoplan Aktiengesellschaft Method for Repairing the Electric Insulation Layers between Pieces of Sheet Metal of Sheet Metal Segments of Electric Generators and Motors
US20060226729A1 (en) * 2003-09-05 2006-10-12 Du Hung T Field assemblies and methods of making same with field coils having multiple coils
US20110115314A1 (en) * 2003-09-05 2011-05-19 Black And Decker Inc. Power tools with motor having a multi-piece stator
US20110302769A1 (en) * 2010-06-15 2011-12-15 Aisin Aw Co., Ltd. Method of manufacturing stator
US20140115875A1 (en) * 2012-10-26 2014-05-01 Mitsubishi Electric Corporation Method of manufacturing stator of electric rotating machine
US20150020376A1 (en) * 2012-03-05 2015-01-22 Robert Bowch GmbH Apparatus and Method for Winding an Electric-Motor Laminated Core with a Magnet Coil
US20170241680A1 (en) * 2013-01-28 2017-08-24 Martin Thomas Lange Motor for use in refrigerant environment
US20180109157A1 (en) * 2015-04-27 2018-04-19 Voith Patent Gmbh Method of making multi-turn coils
US20180212488A1 (en) * 2015-07-20 2018-07-26 Schaeffler Technologies AG & Co. KG Coil winding comprising hf litz wire, electrical machine comprising a coil winding of this kind, and method for producing said coil winding
US10778059B2 (en) * 2015-03-31 2020-09-15 Baker Hughes, A Ge Company, Llc Method of encapsulating motor windings of electrical submersible pump in bonded ceramic
US20210242759A1 (en) * 2018-05-04 2021-08-05 Siemens Aktiengesellschaft Electric Insulation System of an Electric Motor, and Associated Manufacturing Process
US20210242760A1 (en) * 2018-05-04 2021-08-05 Siemens Aktiengesellschaft Electric Insulation System of an Electric Motor, and Associated Manufacturing Process
US11295935B2 (en) * 2015-05-11 2022-04-05 Ebara Corporation Electromagnet device, electromagnet controller, electromagnet control method, and electromagnet system
US20220173629A1 (en) * 2019-09-26 2022-06-02 Kabushiki Kaisha Toshiba Coil, and dynamo-electric machine
US20220271596A1 (en) * 2019-11-11 2022-08-25 Denso Corporation Rotating electric machine and method of manufacturing rotating electric machine
US20230179053A1 (en) * 2020-05-06 2023-06-08 Robert Bosch Gmbh Stator of an electric machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS496403A (en:Method) * 1972-05-08 1974-01-21
JPS5385502U (en:Method) * 1976-12-15 1978-07-14
DE3842563A1 (de) * 1988-12-17 1990-06-21 Bosch Gmbh Robert Isolierter leiter

Citations (6)

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Publication number Priority date Publication date Assignee Title
US2464568A (en) * 1945-05-14 1949-03-15 Gen Electric Electrical coil insulated with thermoplastic particles and thermoset polymer
US2937408A (en) * 1954-06-01 1960-05-24 Smith Corp A O Method to insulate dynamoelectric machine windings by centrifugally casting
US3030597A (en) * 1958-02-28 1962-04-17 Westinghouse Electric Corp Insulated electrical apparatus
US3145127A (en) * 1961-06-28 1964-08-18 Gen Electric Method of insulating electrical components, such as small electric motors
US3436811A (en) * 1966-02-14 1969-04-08 Emerson Electric Co Method for encapsulating dynamoelectric machine stators using a conformable sleeve
US3474527A (en) * 1965-04-02 1969-10-28 Siemens Ag Method of treating insulation of electric machines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2464568A (en) * 1945-05-14 1949-03-15 Gen Electric Electrical coil insulated with thermoplastic particles and thermoset polymer
US2937408A (en) * 1954-06-01 1960-05-24 Smith Corp A O Method to insulate dynamoelectric machine windings by centrifugally casting
US3030597A (en) * 1958-02-28 1962-04-17 Westinghouse Electric Corp Insulated electrical apparatus
US3145127A (en) * 1961-06-28 1964-08-18 Gen Electric Method of insulating electrical components, such as small electric motors
US3474527A (en) * 1965-04-02 1969-10-28 Siemens Ag Method of treating insulation of electric machines
US3436811A (en) * 1966-02-14 1969-04-08 Emerson Electric Co Method for encapsulating dynamoelectric machine stators using a conformable sleeve

Cited By (59)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877142A (en) * 1970-12-27 1975-04-15 Nippon Denso Co Method of making a rotary electric machine especially suitable for use as a starter for automotive vehicle engines
US4112041A (en) * 1975-02-17 1978-09-05 Canadian General Electric Company Method for reducing corona in dynamoelectric machines
US4289722A (en) * 1980-07-28 1981-09-15 General Motors Corporation Method of potting magnetic speed pickups
DE3346031A1 (de) * 1982-12-20 1984-06-20 Mitsubishi Denki K.K., Tokio/Tokyo Spulenisolationsverfahren fuer elektrische maschinen
DE3528492A1 (de) * 1985-08-08 1987-02-12 Resicoat Gmbh Verfahren zum schuetzen von elektrischen bauteilen
US6075304A (en) * 1997-04-30 2000-06-13 Alon Co., Ltd Stator with molded encasement for small motors and manufacturing process therefor
US6484388B1 (en) * 2000-08-10 2002-11-26 Delphi Technologies, Inc. Sequential roll-forming process for a stator
US20040194287A1 (en) * 2000-10-25 2004-10-07 Conception Et Developpement Michelin Electrical rotating machine and process for the manufacture thereof
US20030001440A1 (en) * 2000-10-25 2003-01-02 Gerald Bourqui Electrical rotating machine and process for the manufacture thereof
US6756710B2 (en) 2000-10-25 2004-06-29 Conception Et Developpement Michelin Electrical rotating machine and process for the manufacture thereof
CN1306680C (zh) * 2000-10-25 2007-03-21 米其林创意开发股份有限公司 旋转电机
CN100561832C (zh) * 2000-10-25 2009-11-18 米其林研究和技术股份有限公司 制造旋转电机定子的方法
US7587807B2 (en) 2000-10-25 2009-09-15 Conception Et Developpement Michelin Method for manufacturing a stator of an electrical rotating machine
US7574790B2 (en) 2000-10-25 2009-08-18 Conception Et Developpement Michelin Method for manufacturing a stator of an electrical rotating machine
US20080005888A1 (en) * 2000-10-25 2008-01-10 Conception Et Developpement Michelin Electrical rotating machine and process for the manufacture thereof
WO2002035685A1 (fr) * 2000-10-25 2002-05-02 Conception Et Developpement Michelin Machine electrique tournante et procede de fabrication
EP2031734A3 (en) * 2001-09-28 2011-04-06 Nikkiso Company, Ltd. Insulation member for coil in electrical machines and slot liner for rotary electrical machine
US20050101695A1 (en) * 2001-09-28 2005-05-12 Yoshihiko Wada Insulating material for electric device coil and slot liner of rotating electric machine
EP1432100A4 (en) * 2001-09-28 2008-02-27 Nikkiso Co Ltd INSULATION MATERIAL FOR THE COIL OF AN ELECTRICAL EQUIPMENT AND SLOT EQUIPMENT OF AN ELECTRIC LATHE
US7015396B2 (en) * 2001-09-28 2006-03-21 Nikkiso Co., Ltd. Insulation material for electrical machines
US7233091B2 (en) 2003-09-05 2007-06-19 Black & Decker Inc. Electric motor with field assemblies having core pieces with mating features
US8558420B2 (en) 2003-09-05 2013-10-15 Black & Decker Inc. Power tool with motor having a multi-piece stator
US7146706B2 (en) 2003-09-05 2006-12-12 Black & Decker Inc. Method of making an electric motor
US20070024151A1 (en) * 2003-09-05 2007-02-01 Du Hung T Electric motor having a field assembly with slot insulation
US7078843B2 (en) 2003-09-05 2006-07-18 Black & Decker Inc. Field assemblies and methods of making same
US7205696B2 (en) 2003-09-05 2007-04-17 Black & Decker Inc. Field assemblies having pole pieces with ends that decrease in width, and methods of making same
US7211920B2 (en) 2003-09-05 2007-05-01 Black & Decker Inc. Field assemblies having pole pieces with axial lengths less than an axial length of a back iron portion and methods of making same
US20060226729A1 (en) * 2003-09-05 2006-10-12 Du Hung T Field assemblies and methods of making same with field coils having multiple coils
US8207647B2 (en) 2003-09-05 2012-06-26 Black & Decker Inc. Power tools with motor having a multi-piece stator
US20050189840A1 (en) * 2003-09-05 2005-09-01 Du Hung T. Field assemblies having pole pieces with axial lengths less than an axial length of a back iron portion and methods of making same
US20050189839A1 (en) * 2003-09-05 2005-09-01 Du Hung T. Field assemblies having pole pieces with ends that decrease in width, and methods of making same
US7528520B2 (en) 2003-09-05 2009-05-05 Black & Decker Inc. Electric motor having a field assembly with slot insulation
US20050189844A1 (en) * 2003-09-05 2005-09-01 Du Hung T. Field assemblies having pole pieces with dovetail features for attaching to a back iron piece(s) and methods of making same
US20050099085A1 (en) * 2003-09-05 2005-05-12 Du Hung T. Electric motor having a field assembly with slot insulation
US20050099087A1 (en) * 2003-09-05 2005-05-12 Du Hung T. Electric motor with field assemblies having core pieces with mating features
US20050057113A1 (en) * 2003-09-05 2005-03-17 Du Hung T. Field assemblies and methods of making same
US20110115314A1 (en) * 2003-09-05 2011-05-19 Black And Decker Inc. Power tools with motor having a multi-piece stator
US7235146B2 (en) * 2004-04-28 2007-06-26 Sensoplan Aktiengesellschaft Method for repairing the electric insulation layers between pieces of sheet metal of sheet metal segments of electric generators and motors
US20050241131A1 (en) * 2004-04-28 2005-11-03 Sensoplan Aktiengesellschaft Method for Repairing the Electric Insulation Layers between Pieces of Sheet Metal of Sheet Metal Segments of Electric Generators and Motors
US20110302769A1 (en) * 2010-06-15 2011-12-15 Aisin Aw Co., Ltd. Method of manufacturing stator
US20150020376A1 (en) * 2012-03-05 2015-01-22 Robert Bowch GmbH Apparatus and Method for Winding an Electric-Motor Laminated Core with a Magnet Coil
US9843245B2 (en) * 2012-03-05 2017-12-12 Robert Bosch Gmbh Apparatus and method for winding an electric-motor laminated core with a magnet coil
US20140115875A1 (en) * 2012-10-26 2014-05-01 Mitsubishi Electric Corporation Method of manufacturing stator of electric rotating machine
US9559573B2 (en) * 2012-10-26 2017-01-31 Mitsubishi Electric Corporation Method of manufacturing stator of electric rotating machine
US20170241680A1 (en) * 2013-01-28 2017-08-24 Martin Thomas Lange Motor for use in refrigerant environment
US10670310B2 (en) * 2013-01-28 2020-06-02 Regal Beloit America, Inc. Motor for use in refrigerant environment
US10778059B2 (en) * 2015-03-31 2020-09-15 Baker Hughes, A Ge Company, Llc Method of encapsulating motor windings of electrical submersible pump in bonded ceramic
US10523076B2 (en) * 2015-04-27 2019-12-31 Voith Patent Gmbh Method of making multi-turn coils
US20180109157A1 (en) * 2015-04-27 2018-04-19 Voith Patent Gmbh Method of making multi-turn coils
US11295935B2 (en) * 2015-05-11 2022-04-05 Ebara Corporation Electromagnet device, electromagnet controller, electromagnet control method, and electromagnet system
US20180212488A1 (en) * 2015-07-20 2018-07-26 Schaeffler Technologies AG & Co. KG Coil winding comprising hf litz wire, electrical machine comprising a coil winding of this kind, and method for producing said coil winding
US20210242759A1 (en) * 2018-05-04 2021-08-05 Siemens Aktiengesellschaft Electric Insulation System of an Electric Motor, and Associated Manufacturing Process
US20210242760A1 (en) * 2018-05-04 2021-08-05 Siemens Aktiengesellschaft Electric Insulation System of an Electric Motor, and Associated Manufacturing Process
US20220173629A1 (en) * 2019-09-26 2022-06-02 Kabushiki Kaisha Toshiba Coil, and dynamo-electric machine
US12348096B2 (en) * 2019-09-26 2025-07-01 Kabushiki Kaisha Toshiba Coil having segment conductors welded with a welded metal portion
US20220271596A1 (en) * 2019-11-11 2022-08-25 Denso Corporation Rotating electric machine and method of manufacturing rotating electric machine
US12176778B2 (en) * 2019-11-11 2024-12-24 Denso Corporation Rotating electric machine and method of manufacturing rotating electric machine having filled gaps between electrical conductor wire wound to form armature coil
US20230179053A1 (en) * 2020-05-06 2023-06-08 Robert Bosch Gmbh Stator of an electric machine
US12244193B2 (en) * 2020-05-06 2025-03-04 Robert Bosch Gmbh Stator of an electric machine

Also Published As

Publication number Publication date
GB1349386A (en) 1974-04-03
CA949731A (en) 1974-06-25
BE770858A (fr) 1972-02-03
FR2103966A5 (en:Method) 1972-04-14
ES393485A1 (es) 1973-09-16
JPS474373A (en:Method) 1972-03-03

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